Dual fuel tanks questions
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Dual fuel tanks questions

  1. #1
    Mikes1975StarbuckJetBoat
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    Default Dual fuel tanks questions

    Okay...I admit it...I'm a newbie to Jetboats. I bought an 18' 1975 Starbuck Jetboat last year. I had to replace the rack and pinion steering on it about 14 days ago, as it was stiff steering. I had to pull out the left fuel tank and most of the interior to get the old cable out to replace it.

    Information:

    I have a 3 way single pole selector switch on my dashboard. Up is showing right tank on fuel gauge, middle is showing left tank on fuel gauge, and down shows nada on the gauge. Down is maybe a fuel cut off position?

    I have a fuel selector switch (electrical) under the transom area, and I was told (when I bought the boat) that I should use the left tank first and that gas overflow will flow back into the right tank. (does this sound right to you guys?) I wish I knew what I was doing, and how this is supposed to be setup properly. I don't have any diagrams for the boat, or know where to turn to as the manufacturer is no longer in business. I have a BB 402 Chevy engine with mechanical fuel pump on the engine. Can anyone provide a logical fuel system routing diagram for fuel hoses, selector switch, and wiring for how these are supposed to be hooked up correctly with dual tanks? I need some help figuring this thing out, so I don't blow myself up.

    When I removed the left tank I only disconnected the fuel line, the two sending unit wires, and the fuel fill hose to the tank, so I could get access to the steering cable. I haven't done anything else to it. (besides reassemble it). I just would like to know how this is supposed to be hooked up correctly, so I can ensure it is working right. I would also like some advise for which fuel tank I should use first, because I don't believe what the guy told me was correct.

    Any help or advice would be appreciated.

    Mike in Misery (Missouri)

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  3. #2
    Boss of the McIntyre Mob danhercules's Avatar
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    The more crap ya got on a boat, more to go wrong.

    On my old 18' jet, I had one fuel gauge. No switch. Both lines from the fuel tanks "t"ed into one, then thru a filter and then pump and then to motor. Both tanks drained equally. Simple and easy. I would suggest this. I believe most jet boats are done this way.


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  4. #3
    Senior Member hihosilver's Avatar
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    x2 make it simple

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  6. #4
    Mikes1975StarbuckJetBoat
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    Quote Originally Posted by danhercules View Post
    The more crap ya got on a boat, more to go wrong.

    On my old 18' jet, I had one fuel gauge. No switch. Both lines from the fuel tanks "t"ed into one, then thru a filter and then pump and then to motor. Both tanks drained equally. Simple and easy. I would suggest this. I believe most jet boats are done this way.
    Thanks for your advice! Your suggestion sounds pretty logical to me, and alot safer too. Would I need to do anythink else for tank venting? Just curious, as I know pretty close to nothing about this. The local marina's wont touch my boat because it's a "jetboat". Which is why I had to do the steering myself too.

    Mike in Misery (Missouri)

  7. #5
    Senior Member nick's Avatar
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    I cant tell you much about your venting questions but I can say that you should deffinately ditch all that electrical stuff and just bring each tank line into a Y and then one line to the pump, filter then motor.

    Simple and easy, and if you still want to have a tank selector type set up you can easily build your own. Here is a pic of my garage build. Most if it came from HomeDepot and the anodized Y came from Jegs and was like $25.00.

    Good luck!
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  8. #6
    Senior Member earlbrown's Avatar
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    I would recommend some sort of shut off valve so you can run off of one tank.
    If one tank runs dry the engine will quit pulling from the other tank and you're dead in the water. It's a real bitch to get that tanked primed if you run it dry too.
    When you start the day with fuel in both sides just pull off of both of them at the same time. The engine will pull fuel from whichever side is higher. If you don't have any check valves then they'll self level after a little while. If you do have check valves just shut off the low tank when it gets to E and cruise home on the other.

  9. #7
    Mikes1975StarbuckJetBoat
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    Default Dual fuel tanks questions

    Thanks again for the responses to my thread you guys!

    You all Rock!

    I really appreciate the picture too. A Very clean setup. I plan to model my fuel line system exactly the same way you have them shown in the pic.

    Mike in Misery...pronounced misery!

  10. #8
    Senior Member nick's Avatar
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    Quote Originally Posted by Mikes1975StarbuckJetBoat View Post
    Thanks again for the responses to my thread you guys!

    You all Rock!

    I really appreciate the picture too. A Very clean setup. I plan to model my fuel line system exactly the same way you have them shown in the pic.

    Mike in Misery...pronounced misery!

    Mike, make sure to post pics when you're done.

  11. #9
    Banne'd Cobra1's Avatar
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    One draw back when pulling from both tanks. When your'e out of fuel, your'e shit out of luck. I draw one down to about an 1/8th and switch tanks. This way I can run hard, if I run out I know I have enough to get me back to the dock or shore. Better to be safe than pulled in by a 2smoke. I run a 2smoke and wouldn't like to sit behind one being towed.

  12. #10
    Mikes1975StarbuckJetBoat
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    Default Dual fuel tanks questions

    Quote Originally Posted by nick View Post
    Mike, make sure to post pics when you're done.
    Okay...I have built a manual fuel tank valve assembly. I had to go to O'Reilly's Autoparts for the three fuel line barbs with 3/3 NPT threads.
    I went to the local hardware store for the brass T fitting with 3/8 NPT threads, and a second local Hardware store for the rest of the adapters that the first place didn't have so I could peice it all together.
    I didn't use the JEGS part for the three way adapter, as I couldn't wait around for it and I thought it was a little pricey at around 25 dollars plus shipping.
    I used a three way brass T fitting with 3/8 NPT threads at each exit. I then used some adapters to extend out the two lines toward both tank lines, and I added two separate ball selector shutoff valves onto each fuel tank line. I wanted to do this, so I could shut off either fuel tank, or both fuel tanks to prevent fuel from going to the carbs for winterization later down the road.
    I added some extra adapters to allow the fuel line fittings to be inserted into the ends of the ball valves at each end of the assembly. The bottom of the T fitting goes into a single fuel outlet using a 3/8 NPT barb fitting.
    I'm not sure if the attachment worked for this reply...I tried to attach one. You might have to look at my profile pics to see it.
    If you can see my fuel line adapter, please tell me what you think.
    I haven't started to remove the fuel lines off the tanks yet, I want to take a few more pictures before I tear into it. I know the left tank somehow sends gas to the right tank the way it is set up now. I want to ensure I get this right. I will take a few more pictures of the way the fuel pump is setup too, as I think there is some sort odd return line setup? I'll get back to you if I have anymore questions, and hopefully you can answer them.
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  13. #11
    Senior Member Ken F's Avatar
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    Mike where are you from in Misery?

    Ken
    The liberals are asking us to give Obama time. We agree and think 25 to life would be appropriate.

  14. #12
    Mikes1975StarbuckJetBoat
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    Default Dual fuel tanks questions

    Quote Originally Posted by Ken F View Post
    Mike where are you from in Misery?

    Ken
    I live a little north of Excelsior Springs Missouri up Hiway 69 north of town about 2 miles.

  15. #13
    Senior Member nick's Avatar
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    Looks good Mike, good luck on the assembly! Can't wait to hear how it works.

  16. #14
    Glendale Arizona Squirtcha?'s Avatar
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    One thing I might add (a little something I learned the hard way). When putting fuel system hardware together it's a good idea to use teflon paste as opposed to tape on the joints. The tape can come apart and mess up your fuel pump, carb, filter etc.
    Last edited by Squirtcha?; 06-16-2009 at 08:48 AM.

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